[Webkit-unassigned] [Bug 129371] New: [CSSRegions] ASSERTION FAILED: !m_regionsInvalidated in RenderFlowThread::regionAtBlockOffset

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=129371

           Summary: [CSSRegions] ASSERTION FAILED: !m_regionsInvalidated
                    in RenderFlowThread::regionAtBlockOffset
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mihnea at adobe.com
                CC: WebkitBugTracker at adobe.com
            Blocks: 84900


When i load a page with a video from a named flow displayed in the overflow area of a region, i hit the above assert with the following trace:

ASSERTION FAILED: !m_regionsInvalidated
/Volumes/SSD/WebKit/Source/WebCore/rendering/RenderFlowThread.cpp(426) : WebCore::RenderRegion *WebCore::RenderFlowThread::regionAtBlockOffset(const WebCore::RenderBox *, WebCore::LayoutUnit, bool, WebCore::RenderFlowThread::RegionAutoGenerationPolicy)
1   0x1087140b0 WTFCrash
2   0x10fbdabc7 WebCore::RenderFlowThread::regionAtBlockOffset(WebCore::RenderBox const*, WebCore::LayoutUnit, bool, WebCore::RenderFlowThread::RegionAutoGenerationPolicy)
3   0x10fbda960 WebCore::RenderFlowThread::regionForCompositedLayer(WebCore::RenderLayer&)
4   0x10fbdaeb6 WebCore::RenderFlowThread::updateLayerToRegionMappings(WebCore::RenderLayer&, WTF::HashMap<WebCore::RenderLayer*, WebCore::RenderNamedFlowFragment*, WTF::PtrHash<WebCore::RenderLayer*>, WTF::HashTraits<WebCore::RenderLayer*>, WTF::HashTraits<WebCore::RenderNamedFlowFragment*> >&, WTF::HashMap<WebCore::RenderNamedFlowFragment*, WTF::Vector<WebCore::RenderLayer*, 0ul, WTF::CrashOnOverflow>, WTF::PtrHash<WebCore::RenderNamedFlowFragment*>, WTF::HashTraits<WebCore::RenderNamedFlowFragment*>, WTF::HashTraits<WTF::Vector<WebCore::RenderLayer*, 0ul, WTF::CrashOnOverflow> > >&, bool&)
5   0x10fbda3d7 WebCore::RenderFlowThread::updateAllLayerToRegionMappings()
6   0x10eba54b6 WebCore::RenderFlowThread::updateAllLayerToRegionMappingsIfNeeded()
7   0x10fbdae4a WebCore::RenderFlowThread::cachedRegionForCompositedLayer(WebCore::RenderLayer&)
8   0x10fc61e94 WebCore::RenderLayerBacking::adjustAncestorCompositingBoundsForFlowThread(WebCore::LayoutRect&, WebCore::RenderLayer const*) const
9   0x10fc5d054 WebCore::RenderLayerBacking::updateGraphicsLayerGeometry()
10  0x10fc44823 WebCore::RenderLayer::styleChanged(WebCore::StyleDifference, WebCore::RenderStyle const*)
11  0x10fc8b2f5 WebCore::RenderLayerModelObject::styleDidChange(WebCore::StyleDifference, WebCore::RenderStyle const*)
12  0x10fb62676 WebCore::RenderBox::styleDidChange(WebCore::StyleDifference, WebCore::RenderStyle const*)
13  0x10fceb2bd WebCore::RenderReplaced::styleDidChange(WebCore::StyleDifference, WebCore::RenderStyle const*)
14  0x10fc0ffcd WebCore::RenderImage::styleDidChange(WebCore::StyleDifference, WebCore::RenderStyle const*)
15  0x10fbbc90a WebCore::RenderElement::setStyle(WTF::PassRef<WebCore::RenderStyle>)
16  0x10fbbcd8e WebCore::RenderElement::setAnimatableStyle(WTF::PassRef<WebCore::RenderStyle>)
17  0x11004b1ff WebCore::Style::resolveLocal(WebCore::Element&, WebCore::Style::Change)
18  0x11004aa50 WebCore::Style::resolveTree(WebCore::Element&, WebCore::Style::Change)
19  0x11004ac10 WebCore::Style::resolveTree(WebCore::Element&, WebCore::Style::Change)
20  0x11004ac10 WebCore::Style::resolveTree(WebCore::Element&, WebCore::Style::Change)
21  0x11004a8ec WebCore::Style::resolveTree(WebCore::Document&, WebCore::Style::Change)
22  0x10e96cd06 WebCore::Document::recalcStyle(WebCore::Style::Change)
23  0x10e96927f WebCore::Document::updateStyleIfNeeded()
24  0x10ecdafff WebCore::FrameView::updateLayoutAndStyleIfNeededRecursive()
25  0x1066bb2fb WebKit::WebPage::layoutIfNeeded()
26  0x10653fada WebKit::TiledCoreAnimationDrawingArea::flushLayers()
27  0x10653fdac non-virtual thunk to WebKit::TiledCoreAnimationDrawingArea::flushLayers()
28  0x10f862cfc WebCore::LayerFlushScheduler::runLoopObserverCallback()
29  0x10f862c44 WebCore::LayerFlushScheduler::runLoopObserverCallback(__CFRunLoopObserver*, unsigned long, void*)
30  0x7fff93d02ee7 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__
31  0x7fff93d02e57 __CFRunLoopDoObservers

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